Filter deprecated Long Slow modem preset from picker

Meshtastic/Enums/LoraConfigEnums.swift

@@ -525,12 +525,24 @@ enum ModemPresets: Int, CaseIterable, Identifiable {
 		}
 	}
 
+	/// Presets deprecated upstream that must no longer be offered for new selection,
+	/// mirroring how Android filters them out. They remain as cases so a radio already
+	/// configured on one round-trips through protobuf and renders the correct label.
+	var isDeprecated: Bool {
+		switch self {
+		case .longSlow:
+			return true
+		default:
+			return false
+		}
+	}
+
 	/// Presets selectable for a connected device, given whether its firmware
 	/// implements the 2.8 rework. On older firmware the 2.8-only presets are
 	/// dropped. Callers should additionally constrain this to the selected
 	/// region's legal set via `RegionPresetInfo` when the firmware provides one.
 	static func selectable(supports2_8: Bool) -> [ModemPresets] {
-		allCases.filter { supports2_8 || !$0.requiresFirmware2_8 }
+		allCases.filter { !$0.isDeprecated && (supports2_8 || !$0.requiresFirmware2_8) }
 	}
 
 	/// The conservative (pre-2.8) selectable set. Retained for callers that have

Meshtastic/Views/Settings/Config/LoRaConfig.swift

@@ -76,11 +76,17 @@ struct LoRaConfig: View {
 	/// one. Never empty (spec §6 — never show an empty picker).
 	private var availablePresets: [ModemPresets] {
 		let base = ModemPresets.selectable(supports2_8: supports2_8)
+		var presets = base
 		if let info = regionPresetInfo, !info.presets.isEmpty {
 			let constrained = base.filter { info.presets.contains($0.protoEnumValue()) }
-			if !constrained.isEmpty { return constrained }
+			if !constrained.isEmpty { presets = constrained }
 		}
-		return base
+		// Keep a currently-configured but deprecated preset (e.g. Long Slow on an existing
+		// radio) visible so the picker doesn't render a blank selection.
+		if let current = ModemPresets(rawValue: modemPreset), current.isDeprecated, !presets.contains(current) {
+			presets.append(current)
+		}
+		return presets
 	}
 
 	var body: some View {

MeshtasticTests/LoraDeviceEnumTests.swift

@@ -636,6 +636,20 @@ struct LoRaFirmwareGatingTests {
 		#expect(selectable.contains(.tinyFast))
 		#expect(selectable.contains(.liteSlow))
 	}
+
+	@Test func deprecatedPreset_excludedFromSelectable() {
+		#expect(ModemPresets.longSlow.isDeprecated)
+		#expect(!ModemPresets.selectable(supports2_8: false).contains(.longSlow))
+		#expect(!ModemPresets.selectable(supports2_8: true).contains(.longSlow))
+		#expect(!ModemPresets.userSelectable.contains(.longSlow))
+	}
+
+	@Test func deprecatedPreset_stillExistsForDisplay() {
+		// longSlow remains a case so an existing radio's value round-trips and renders its label.
+		let preset = ModemPresets(rawValue: 1)
+		#expect(preset == .longSlow)
+		#expect(preset?.name == "LongSlow")
+	}
 }
 
 // MARK: - LoRaRegionPresetMap decoding (2.8 region→preset compatibility)